Figure 3.

Streaming line around the cluster and the trajectory of tracers. a) Field vector for the acoustic streaming around nanomotor cluster without and with additional optical radiation force. b) “Firework” behaviors of tracer particles in acoustic field without and with light irradiation (with excitation voltage, frequency, and light intensity of 10 V, 3 MHz, and 17 mW mm⁻², respectively), scale bar: 15 µm. c) Influence of light intensity on diffusion velocity of Au nanomotors (with excitation voltage of 6 V and frequency of 3 MHz). d) Influence of excitation voltage on diffusion velocity of Au nanomotors (with frequency of 3 MHz and light intensity of 17 mW mm⁻²).